Wireless Receiver AGC Range Control for Random Interferers
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Solution Overview
Problem
Wireless receivers operating under protocols like IEEE 802.11 and 802.15.4 face performance degradation due to random and unpredictable interferers, which cannot be adjusted during payload reception, leading to saturation and data loss.
Innovation Solution
Implementing an automatic gain controller (AGC) that determines variable gain settings based on past interferer data, allowing for a restricted gain range during payload reception to maintain sensitivity and immunity to interferers, even when gain adjustments are restricted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gain is continuously adjusted to avoid saturation from interferers, then receiver immunity to interferers is improved, but the ability to maintain sensitivity during payload reception deteriorates due to protocol restrictions
Solution Approach 1:
The system performs gain adjustments during the preamble reception phase before payload reception begins. The AGC controller monitors signal strength during preamble and sets the gain to an optimal level that prevents saturation from potential interferers while maintaining sensitivity for the upcoming payload data, preparing the receiver in advance for the constrained payload reception period
Solution Approach 2:
The system dynamically adjusts gain settings based on real-time signal conditions during preamble reception. The AGC controller continuously monitors received signal strength and adapts the gain level accordingly, transitioning from dynamic adjustment during preamble to a fixed but optimally-set gain during payload reception, balancing interferer protection with sensitivity requirements
2Adaptability or versatility
If gain is fixed before payload reception, then protocol compliance is improved, but receiver performance deteriorates due to inability to adjust for random interferers during payload reception
Solution Approach 1:
The system uses the preamble reception phase to perform all necessary gain adjustments before payload reception begins. The AGC controller monitors signal strength and sets the optimal gain level during preamble, ensuring the receiver is properly calibrated before entering the protocol-constrained payload phase where gain adjustments are prohibited
Solution Approach 2:
The system anticipates potential interferers during preamble reception and pre-adjusts the gain level to counteract their effects before payload reception begins. By monitoring signal strength and identifying potential interferer conditions during preamble, the AGC sets a gain level that prevents saturation from random interferers that may appear during the fixed-gain payload phase
Data Source
AI summary
Wireless receivers and related methods with interferer immunity are disclosed. The receiver includes a receive (RX) front-end, a power level detector, and an automatic gain controller (AGC). The RX front-end includes circuit(s) having variable gains, and the power level detector outputs a power level indicator. The AGC receives the power level indicator and outputs the gain settings to the variable-gain circuits within the RX front-end. Further, the AGC is configured to adjust the gain settings within a first gain range when not receiving data frames and to adjust them within a second gain range when receiving data frames. The second gain range is a restricted version of the first gain range. Further, the AGC can be configured to detect and store gain settings within a sliding time window when data frames are not being received and to use these stored gain settings to determine the second gain range.